Java Collections.sort方法对list集合排序

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1、排序测试类

package com.web.test;import java.util.ArrayList;import java.util.Collections;import java.util.Comparator;import java.util.List;public class UserSort {    public static void main(String[] args) {        List<User> userList =new ArrayList<User>();        userList.add(new User(1,2.2));        userList.add(new User(2,1.1));        userList.add(new User(3,4.4));        userList.add(new User(4,5.5));        userList.add(new User(5,3.3));        Collections.sort(userList, new Comparator<User>() {            public int compare(User u1, User u2) {                return new Double(u1.getSalary()).compareTo(new Double(u2.getSalary())); //升序                // return new Double(u2.getSalary()).compareTo(new Double(u2.getSalary())); //降序            }        });        for(User user : userList){            System.out.println(user);        }    }}

2、User对象，存储javabean属性

package com.web.test;import java.io.Serializable;/** * 用户 * * @author Web */public class User implements Serializable{    private static final long serialVersionUID = 1L;    private long id; // 主键    private double salary; // 薪资    public User() {    }    public User(long id, double salary) {        super();        this.id = id;        this.salary = salary;    }    public long getId() {        return id;    }    public void setId(long id) {        this.id = id;    }    public double getSalary() {        return salary;    }    public void setSalary(double salary) {        this.salary = salary;    }    @Override    public String toString() {        return "User [id=" + id + ", salary=" + salary + "]";    }}

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